如何在ESP32服务器上处理带有JSON负载的POST请求？

#include <WiFi.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <ArduinoJson.h>

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

AsyncWebServer server(80);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  
  Serial.println(WiFi.localIP());
  
  server.on("/post", HTTP_POST, [](AsyncWebServerRequest *request){
    if (request->hasParam("plain", true)) {
      String jsonString = request->getParam("plain", true)->value();
      
      StaticJsonDocument<200> doc;
      DeserializationError error = deserializeJson(doc, jsonString);
      
      if (error) {
        Serial.print(F("deserializeJson() failed: "));
        Serial.println(error.c_str());
        request->send(400, "application/json", "{\"error\":\"Invalid JSON\"}");
        return;
      }
      
      // 处理JSON数据
      String output;
      serializeJson(doc, output);
      Serial.println(output);
      
      // 发送响应
      request->send(200, "application/json", "{\"status\":\"success\"}");
    } else {
      request->send(400, "text/plain", "Bad Request");
    }
  });
  
  server.begin();
}

void loop() {
  // 主循环可以保持空闲，因为事件驱动的处理在setup中已经设置好了
}